crond: add handling of "MAILTO=user" lines

sendmail: handle a case when the whole mail comes from stdin
(and no separate sender/subj is provided)
both by dronnikov AT gmail.com

function                                             old     new   delta
sendgetmail_main                                    1509    1674    +165
SynchronizeFile                                      671     767     +96
packed_usage                                       24054   24088     +34
crond_main                                          1404    1420     +16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 311/0)             Total: 311 bytes

1 files changed, 26 insertions, 2 deletions

diff --git a/networking/sendmail.c b/networking/sendmail.c
index 973d712b9..242bb0eaf 100644
--- a/networking/sendmail.c
+++ b/networking/sendmail.c
@@ -273,6 +273,7 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
 
                 OPTS_c = 1 << 6,        // sendmail: assumed charset
                 OPTS_t = 1 << 7,        // sendmail: recipient(s)
+                OPTS_i = 1 << 8,        // sendmail: ignore lone dots in message body (implied)
         };
 
         const char *options;
@@ -288,8 +289,8 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
                 // SENDMAIL
                 // save initial stdin (body or attachements can be piped!)
                 xdup2(STDIN_FILENO, INITIAL_STDIN_FILENO);
-                opt_complementary = "-2:w+:t:t::"; // count(-t) > 0
-                options = "w:U:P:X" "ns:c:t:";
+                opt_complementary = "-2:w+:t::";
+                options = "w:U:P:X" "ns:c:t:i";
         } else {
                 // FETCHMAIL
                 opt_after_connect = NULL;
@@ -346,6 +347,29 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
                 // get the sender
                 opt_from = sane(*argv++);
 
+                // if no recipients _and_ no body files specified -> enter all-included mode
+                // i.e. scan stdin for To: and Subject: lines ...
+                // ... and then use the rest of stdin as message body
+                if (!opt_recipients && !*argv) {
+                        // fetch recipients and (optionally) subject
+                        char *s;
+                        while ((s = xmalloc_reads(INITIAL_STDIN_FILENO, NULL, NULL)) != NULL) {
+                                if (0 == strncmp("To: ", s, 4)) {
+                                        llist_add_to_end(&opt_recipients, s+4);
+                                } else if (0 == strncmp("Subject: ", s, 9)) {
+                                        opt_subject = s+9;
+                                        opts |= OPTS_s;
+                                } else {
+                                        char first = s[0];
+                                        free(s);
+                                        if (!first)
+                                                break; // empty line
+                                }
+                        }
+                        // order to read body from stdin
+                        *--argv = (char *)"-";
+                }
+
                 // introduce to server
                 // we should start with modern EHLO
                 if (250 != smtp_checkp("EHLO %s", opt_from, -1)) {